Bump httpx from 0.28.0 to 0.28.1

Bumps [httpx](https://github.com/encode/httpx) from 0.28.0 to 0.28.1.
- [Release notes](https://github.com/encode/httpx/releases)
- [Changelog](https://github.com/encode/httpx/blob/master/CHANGELOG.md)
- [Commits](encode/httpx@0.28.0...0.28.1)

---
updated-dependencies:
- dependency-name: httpx
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements-dev.txt

@@ -1,5 +1,5 @@
 -r requirements.txt
-httpx==0.28.0
+httpx==0.28.1
 pytest==8.3.4
 pytest-xdist==3.6.1
 ruff==0.8.1